Final Reports of the Federal Building and Fire
Investigation of the World Trade Center Disaster
NIST NCSTAR 1-4: Active Fire Protection Systems
The National Institute of Standards and Technology investigation of
active fire protection systems in World Trade Center (WTC) 1, 2, and 7
included the design, installation, capabilities, and performance on
September 11, 2001, of the automatic fire sprinkler, standpipe, standpipe
preconnected hoses, fire alarm, and smoke management systems. The purpose
and normally expected performance of each active fire protection system in
the buildings are described, as well as details about the systems installed
in WTC 1, 2, and 7. Using fire protection engineering methods, the
capabilities of the installed systems to respond to various fire threats
from normal office fires up to and including the extraordinary challenge of
the fires ignited by the aircraft impacts on September 11, 2001, were
assessed. Information from The Fire Department of the City of New York
records was used to document the history of significant fire events in WTC
1, 2, and 7. Findings of the investigation are presented with regard to the
fire suppression, fire alarm, and smoke management systems installed on the
day the buildings collapsed.
The reports provided here are presented in .pdf format. To read these files, you can download
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files for Project 1-4 may also be downloaded as a group within a
WINZIP (.zip) file. (Note: this
file is large - 72.5 MB)
